I get it as well,and it happens even if you don't have a camera distance hack. Its like the top portion of the screen is inactivate unless you edge pan abit. Its much more noticeable with a cam hack though.

I'm moving to China next week and probably won't have time to work on this so I've uploaded the source code in the first post, it's a bit messy and uses some snippets of code from around the web so just post here if you need me to explain anything.